Redis is an open-source, in-memory data store that serves as a versatile database, cache, streaming engine, and message broker. Loved by millions of developers, Redis offers a wide range of core capabilities, including support for in-memory data structures, server-side scripting, persistence, clustering, and high availability. It finds applications in real-time data storage, caching, session storage, streaming, messaging, and more. Redis Stack extends Redis with modern data models and processing engines, providing a complete developer experience with features like searchable JSON, time series data models, and extended probabilistic data structures.